Which of the following reactions carried out in closed vessels are reversible ?
(1) `2KCIO_(3)rarr 2KCI+O_(2)`
(2) `N_(2)+O_(2)rarr2NO`
(3) `PCI_(5)rarrPCI_(3)+CI_(2)`
(4) `Fe^(3+)+SCN^(-)rarr[Fe(SCN)]^(2+)`

Options

A. (i), (ii), (iii), (iv)
B. (ii), (iii), (iv)
C. (i), (ii), (iii)
D. (i), (iii), (iv)

Answer

B

Explanation

Reaction (i) is irreversible because `O_(2)` cannot react with KCl to from `KClO_(3)`.